The N64 microphone is an accessory for the Nintendo 64 gaming console, designed primarily for use with specific games that supported voice recognition and commands. It was released in conjunction with games like "Hey You, Pikachu!" The microphone is a small, circular device that plugs into the controller's memory expansion slot. It features a built-in microphone element that allows players to interact with games using voice commands, such as calling out to Pikachu in "Hey You, Pikachu!"